TWI516739B - Horizontal thermal processing device - Google Patents

Description

Horizontal heat treatment device

The present invention relates to a heat treatment apparatus which can be preferably used for a refractory furnace for flaming a carbon fiber precursor fiber bundle.

Conventionally, in the production of a long product of a film, a sheet, a fiber, or the like (hereinafter referred to as a workpiece), a heat treatment apparatus that continuously heat-treats a workpiece is known. In the case of the heat treatment apparatus, in the case of carbon fiber, for example, a heat treatment is performed on a precursor fiber containing, for example, a polyacrylonitrile-based fiber in a heat treatment chamber. At this time, a decomposition gas such as a cyanide compound, ammonia, and carbon monoxide is generated in the heat treatment chamber by the oxidation reaction of the precursor fiber. The decomposition gas must be recovered and subjected to gas treatment such as combustion treatment.

In the heat treatment apparatus, in order to prevent the decomposition gas from leaking out of the heat treatment apparatus from the inlet/outlet of the precursor fiber bundle of the heat treatment apparatus, the decomposition apparatus is provided adjacent to the heat treatment chamber. In the sealed chamber in which the decomposition gas is recovered by the negative pressure, and the outside of the inlet/outlet port of the precursor fiber bundle of the sealed chamber is provided, the air outside the heat treatment device is blown toward the workpiece to suppress the air. An air curtain unit in which the outside air flows in; in order to prevent the gas in the sealed chamber from leaking to the outside even if the discharge speed of the air blown toward the workpiece is increased, the seal provided in the heat treatment chamber is connected A cylindrical rectifying member is provided indoors.

Further, there has been proposed a heat treatment apparatus which is provided with a slit at the inlet/outlet of the heat treatment apparatus in order to suppress temperature unevenness in the heat treatment apparatus, and is provided to be ejected from the slit into the heat treatment apparatus or outside the heat treatment apparatus. A mechanism for heating air (see Patent Document 2).

In order to prevent the decomposition gas from leaking from the inlet/outlet port of the precursor fiber bundle of the heat treatment apparatus to the outside of the heat treatment apparatus, a heat treatment apparatus is proposed in which the orientation of the inlet/outlet of the precursor fiber bundle is set to be The air curtain unit that blows air outside the heat treatment device to suppress the inflow of the outside air (see Patent Document 3).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2008-156790

[Patent Document 2] WO02/077337

[Patent Document 3] US6027337

In the heat treatment apparatus described in Patent Document 1, even if the orientation is increased The discharge speed of the air blown by the workpiece can prevent the decomposition gas from leaking out of the outside of the heat treatment apparatus. However, since the inside of the sealed chamber is a negative pressure, the air ejected from the upper and lower nozzles for the air curtain toward the workpiece is easily sucked into the sealed chamber. Therefore, it is necessary to make the amount of air for blowing the air curtain toward the object to be processed more than necessary.

In view of the above, an object of the present invention is to provide a heat treatment apparatus that can prevent a gas in a sealed chamber such as a decomposition gas from leaking to the outside even if the amount of the gas for the air curtain blown toward the workpiece is reduced.

Another object of the present invention is to provide a method for producing a refractory fiber bundle using such a heat treatment apparatus, a method for producing a carbon fiber bundle, and a heat treatment method.

According to an embodiment of the present invention, a horizontal heat treatment apparatus is provided in which a continuous flat workpiece is continuously heat-treated while being transported in a horizontal direction in a heat treatment chamber, and a workpiece is sent to an inlet and a discharge port in the heat treatment chamber. Connected to the sealed chamber, wherein the sealed chamber is connected to the exhaust fan, and the sealed chamber is configured to pass through the sealed chamber in a horizontal direction, and is located in the inlet and the outlet of the processed object in each sealed chamber. The heat treatment chamber is an opening on the opposite side, and is connected to a passage having a rectangular cross section. The passage is configured such that the workpiece can pass through the passage in the horizontal direction, and the inlet of the workpiece connected to the inlet of the sealed chamber is connected to the workpiece. The material to be processed of the heat treatment device is sent to the inlet, and the workpiece delivery port of the passage connected to the processing material outlet of the sealed chamber is sent to the workpiece of the heat treatment device. At the outlet, a pair of nozzles for ejecting gas are provided at upper and lower positions of the respective passages, and the gas discharge ports of the respective nozzles have a rectangular shape, and the pair of nozzles provided in the passages in the respective passages are oriented toward the center in the vertical direction of the passage. And the gas is ejected toward the workpiece inlet or the workpiece outlet of the heat treatment device included in the passage, and the gas outlets of the nozzles provided in the passages and the workpieces of the passages are sent and sent in the respective passages. The longitudinal direction of the outlet is parallel, and has a length equal to the length of the long side, and the gas discharge ports of the pair of nozzles provided in the passage and the workpiece inlet of the heat treatment apparatus included in the passage in each passage Or the distance d mm between the objects to be processed and the outlet, and the height Dn mm of the above passage satisfies 2≦d<0.75Dn.

Preferably, the distance d is 15 mm or more in each passage.

Preferably, in each of the passages, the opening width Wn of the nozzle is 0.5 mm or more and 3 mm or less, and the height Dn of the passage is 20 mm or more and 78 mm or less.

The passages are transported in a horizontal direction at a plurality of positions in the vertical direction, and the passages are provided at a plurality of positions in the vertical direction, and the sealed chambers can be divided corresponding to the respective passages.

Preferably, the gas flow rate adjusting mechanism is provided, and the gas flow rate adjusting mechanism adjusts the discharge amount of the gas for each of the nozzles.

The passage may be the upper passage member, the lower passage member, and the side surface The member is formed by the member, and the upper and lower passage members each have two members via a nozzle, and the two members can be integrated with the spacer member between the two members, and the spacer member determines the gap of the nozzle. .

Preferably, the two members and the spacer member are detachably attachable.

The horizontal heat treatment device may be a heat treatment furnace that heat-treats the carbon fiber precursor fiber bundle.

According to another embodiment of the present invention, there is provided a method of producing a refractory fiber bundle in which a carbon fiber precursor fiber bundle is heat-treated to produce a refractory fiber bundle, and the horizontal heat treatment device is continuously flat The object to be processed is continuously heat-treated while being transported in the horizontal direction in the heat treatment chamber, and a sealed chamber is connected to the workpiece inlet and the outlet of the heat treatment chamber, wherein the sealed chamber is connected to the exhaust fan, and The sealed chamber is configured such that the object to be processed can pass through the sealed chamber in the horizontal direction, and an opening on the opposite side of the heat treatment chamber in the workpiece inlet and the outlet of each of the sealed chambers is connected to a passage having a rectangular cross section. The passage is configured such that the workpiece can pass through the passage in the horizontal direction, and the workpiece inlet of the passage connected to the workpiece inlet of the sealed chamber is the inlet of the workpiece of the heat treatment device, and the object to be treated with the seal chamber The workpiece delivery port of the path for the outlet connection is the workpiece delivery port of the heat treatment device a pair of nozzles for ejecting gas are provided at upper and lower positions of the respective passages, and the gas discharge ports of the respective nozzles have a rectangular shape, and in each of the passages, the pair of nozzles provided in the passage face the center of the passage in the vertical direction, and The gas is ejected toward the workpiece inlet or the workpiece outlet of the heat treatment device included in the passage, and the gas outlets of the nozzles provided in the passages and the workpiece inlet and outlet of the passage are provided in the respective passages. The longitudinal direction of the longitudinal direction is equal to each other, and has a length equal to the length of the long side, and the gas discharge ports of the pair of nozzles provided in the passage and the workpiece inlet of the heat treatment apparatus included in the passage in each passage Or the distance d mm between the workpiece discharge ports and the height Dn mm of the passages satisfying 2≦d<0.75Dn; and the manufacturing method of the refractory fiber bundle includes: using the exhaust fan to make each sealed chamber negative Pressure, in each passage, the amount of gas per metre of the long side of the inlet and outlet of the workpiece to be treated in the passage of each nozzle of the passage It is expressed as V (m ³ /h), and when the gauge pressure in the sealed chamber connected to the above-mentioned passage is expressed as P (Pa), the gas is ejected from each nozzle so as to satisfy V ≦ 30 × P + 21 . .

Preferably, the flow velocity Vo of the gas flowing into the sealed chamber from each passage is set to be 0.1 m/sec or more and 0.5 m/sec or less.

Preferably, the discharge velocity Vs of the gas ejected from each nozzle is set to 3 m/s or more and 30 m/s or less.

According to another embodiment of the present invention, there is provided a method for producing a carbon fiber bundle, comprising: a step of producing a refractory fiber bundle by the method for producing the oxidized fiber bundle; and a step of carbonizing the oxidized fiber bundle.

According to still another embodiment of the present invention, there is provided a heat treatment method for continuously heat-treating a continuous flat object to be processed using the above-described horizontal heat treatment apparatus.

According to the present invention, it is possible to prevent the decomposition gas in the sealed chamber such as the decomposition gas from leaking to the outside even if the amount of the gas for the air curtain blown toward the workpiece is reduced.

Further, a method for producing a refractory fiber bundle using such a heat treatment apparatus, a method for producing a carbon fiber bundle, and a heat treatment method are provided.

1‧‧‧Horizontal heat treatment unit

2‧‧‧heat treatment room

3‧‧‧ Heat treated outdoor wall

4‧‧‧ Sealing room

4a, 4b, 4c‧‧‧ blocks

5‧‧‧The outer wall of the sealed room

6‧‧‧ Heated entrance to the outdoor wall

6'‧‧‧ Heat-treated outdoor wall outlet

7‧‧‧ Sealed outdoor wall entrance

7'‧‧‧Seaned outdoor wall outlet

8‧‧‧Air curtain unit

9a, 9b‧‧‧Pressure chamber (upper and lower)

9a', 9b'‧‧‧ Pressurization chamber (upper side and lower side)

10a, 10b‧‧‧Send into the side curtain nozzle (upper side and lower side)

10a', 10b'‧‧‧Send side air curtain nozzles (upper side and lower side)

11‧‧‧ Heat treatment unit entrance

11'‧‧‧ Heat treatment unit for export

12‧‧‧Isolation board

13, 16‧‧‧ flow adjustment mechanism

14, 17‧‧‧ exhaust fan

15‧‧‧Exhaust port

18‧‧‧Roller

19‧‧‧Access to the side curtain unit

19'‧‧‧Access to the side curtain unit

20‧‧‧ venting holes

21, 22‧‧‧ exhaust path

23‧‧‧ gas supply pipe

24‧‧‧Upper access member (front member)

25‧‧‧Upper access member (rear member)

24'‧‧‧Bottom access member (front member)

25'‧‧‧Bottom access member (rear member)

26‧‧‧Front of fixed members

27‧‧‧ Rear member fixing track

30‧‧‧ spacer components

31‧‧‧Means for distance d adjustment used in the examples

100‧‧‧Testing device used in the examples

101‧‧‧ sealed room

102‧‧‧Air curtain access

103a, 103b‧‧‧air curtain nozzle

104‧‧‧ Exterior of heat treatment unit

105‧‧‧ Heat treatment room entrance

A‧‧‧Precursor fiber bundle (bundle)

d‧‧‧Distance of nozzle 10a, nozzle 10b and delivery port 11

Opening height of the passage of the Dn‧‧‧ air curtain unit

P‧‧‧ sealed indoor pressure

X‧‧‧Moving transport direction of precursor fiber bundles

Vs‧‧‧ gas ejecting wind speed from the nozzle

Vo‧‧‧ gas inflow velocity towards the sealed chamber

Wn‧‧‧ nozzle opening width

Angle of inclination of the θ‧‧‧ nozzle relative to the horizontal plane

FIG. 1 is a schematic configuration diagram showing an example of an overall configuration of a heat treatment apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view showing a curtain unit in an embodiment of the present invention.

3 is an exploded perspective view of a nozzle portion of the air curtain unit.

Fig. 4 is a schematic cross-sectional view showing the overall configuration of a test apparatus used in the examples.

Fig. 5 is a graph showing the relationship between the horizontal axis of the nozzle discharge air velocity Vs and the vertical axis of the discharge chamber velocity Vs and the sealed chamber pressure.

6 is a graph showing the relationship between the horizontal axis represents the distance d between the nozzle 10a, the nozzle 10b, and the inlet port 11, and the vertical axis represents the distance d between the sealed chamber pressure, the discharge speed Vs, and the pressure in the sealed chamber.

Fig. 7 is a configuration diagram of a heat treatment device for simulation performed in the embodiment.

Hereinafter, embodiments of the horizontal heat treatment apparatus of the present invention will be described in detail with reference to the drawings. Here, as a horizontal heat treatment apparatus, a horizontal refractory furnace will be described as an example. That is, the following description will be given: a continuous flat object to be processed is a carbon fiber precursor fiber bundle, and a horizontal heat treatment device is a refractory furnace for refracting a carbon fiber precursor fiber bundle.

In addition, in this specification, "upstream" and "downstream" respectively indicate the upstream and downstream of the moving conveyance direction of a to-be-processed object.

As shown in Fig. 1, a heat treatment apparatus (horizontal refractory furnace) 1 includes a heat treatment chamber 2, a sealed chamber 4 connected to the heat treatment chamber, a sealed chamber 4, and a cross section connected to the sealed chamber 4 and the sealed chamber 4, respectively. A rectangular passage 19 and a passage 19'. The heat treatment apparatus is configured such that the workpiece can be sequentially moved and transported in the passage 19, the sealed chamber 4 (upstream side), the heat treatment chamber 2, the sealed chamber 4 (downstream side), and the passage 19'. The inlet of the passage 19 (the opening on the upstream side) is the inlet of the workpiece of the heat treatment apparatus (the heat treatment apparatus inlet 11), and the outlet of the passage 19' (the opening on the downstream side) is the outlet of the workpiece of the heat treatment apparatus (the outlet of the heat treatment apparatus) 11'). In other words, each of the passages has only one of the workpiece inlet (11) of the heat treatment apparatus and the workpiece outlet (11') of the heat treatment apparatus.

The heat treatment apparatus 1 is provided with a box-shaped heat treatment chamber 2. In the heat treatment chamber 2, a hot air circulation device (not shown) that circulates hot air inside the heat treatment chamber is connected. By this hot air, the object to be processed can be heated and heat-treated. In the case of the heat treatment apparatus, in the case of the carbon fiber, for example, the precursor fiber including the polyacrylonitrile-based fiber is continuously subjected to heat treatment in the heat treatment chamber. At this time, a decomposition gas such as a cyanide compound, ammonia, or carbon monoxide is generated in the heat treatment chamber by the oxidation reaction of the precursor fiber. The decomposition gas must be recovered and subjected to gas treatment such as combustion treatment.

An exhaust port 20 is provided in the heat treatment chamber 2. The exhaust port 20 is connected to the fan 14 via the exhaust path 21 . A flow rate adjusting mechanism 13 such as a valve is provided in the middle of the exhaust path 21. The fan 14 is connected to an external gas recovery processing device (not shown).

(sealed room)

The outer walls (the two side walls facing each other) 3, 3 on the upstream side and the downstream side (the left and right sides of the drawing) on the upstream side and the downstream side of the heat treatment chamber 2, in order to prevent decomposition gas generated in the furnace from the precursor fiber bundle of the heat treatment apparatus The inlet/outlet port leaks out of the heat treatment apparatus, and the sealed chamber 4 and the sealed chamber 4 in which the inside of the chamber is set to a negative pressure and the decomposition gas is recovered are continuously provided. The sealed chamber can be made into a box shape.

The sealing chamber 4, the outer wall 5 of the sealing chamber 4, the outer wall 5 (the side wall on the upstream side of the box-shaped sealing chamber on the upstream side, and the side wall on the downstream side of the box-shaped sealing chamber on the downstream side) are respectively provided for being to be a treatment, for example, comprising a polyacrylonitrile fiber bundle The slit-shaped opening into which the precursor fiber bundle A is fed/sent (the sealed outdoor wall inlet 7 for opening the workpiece to the sealed chamber, and the opening for discharging the workpiece from the sealed chamber, that is, the seal Outdoor wall outlet 7'). Similarly, the heat treatment outdoor wall 3 and the outer wall 3 are provided with a delivery port 6 and a delivery port 6' corresponding to the sealed outdoor wall inlet 7 and the sealed outdoor wall outlet 7', respectively.

That is, the sealed chamber 4 and the sealed chamber 4 are respectively provided on the workpiece inlet (feed inlet 6) side and the outlet (sending outlet 6') side of the heat treatment chamber 2.

As the object to be processed, a long sheet having a width in the depth direction of the drawing can be used. In the case where the object to be treated is a carbon fiber precursor fiber bundle, a plurality of precursor fibers may be arranged in the depth direction of the drawing, and the whole may be aligned into a sheet shape and supplied as a sheet to the heat treatment apparatus.

Inside the sealed chamber 4 and the sealed chamber 4, a partitioning plate 12 that divides the sealed chamber 4 and the sealed chamber 4 into three different blocks 4a, 4b, and 4c in the vertical direction is provided. Further, the sealed chamber 4 and the sealed chamber 4 are provided with an exhaust port 15 and an exhaust port 15, and are connected to the exhaust fan 17 and the exhaust fan 17 via the exhaust path 22 and the exhaust path 22. A flow rate adjusting mechanism 16 such as a valve is provided in the middle of the exhaust path 22 and the exhaust path 22, respectively. The exhaust ports 15 are respectively disposed in the block 4a, the block 4b, and the block 4c.

In the heat treatment apparatus, the sealing chamber 4 and the sealing chamber 4 are partitioned by the partition plate 12 (further, the exhaust port 15 and the flow rate adjusting mechanism 16 are provided for each block), whereby the respective blocks can be appropriately adjusted. The pressure can be individually controlled for the pressure difference in each block of the heat treatment chamber and the sealed chamber, so that the control can be controlled by The inflow of external air into the heat treatment chamber or the outflow of hot air from the heat treatment chamber due to the influence of the difference in buoyancy between the inside and the outside of the heat treatment chamber.

When the heat treatment apparatus is configured to be capable of moving the workpiece in the horizontal direction at a plurality of different positions in the vertical direction, it is particularly effective to divide the sealed chamber. In this case, the passages (19, 19') may be provided at a plurality of different positions in the vertical direction. At this time, the sealed chamber can be divided corresponding to each of the plurality of different positions provided in the vertical direction. The heat treatment apparatus shown in Fig. 1 is configured such that three objects can be transported in the horizontal direction at three different positions in the vertical direction, and three passages are provided at each of the upstream side and the downstream side of the heat treatment apparatus, and the passage is provided. Correspondingly, the sealed chamber is divided into three.

Further, an exhaust gas adjusting mechanism that compares the internal pressure of each of the sealed chambers with the internal pressure of the heat treatment chamber and adjusts the number of revolutions of the exhaust fan, that is, the amount of exhaust gas. Further, a unit for detecting a change in internal pressure in order to automate the exhaust gas adjusting mechanism and a control unit for adjusting an exhaust amount of the exhaust gas adjusting mechanism by a detection signal of the detecting unit may be provided.

In general, the pressure difference between the pressure in the heat treatment chamber and the pressure outside the heat treatment chamber (the pressure of the external air) is at the height of the heat treatment chamber under the influence of the difference in buoyancy between the inside and outside of the heat treatment chamber due to the difference in gas temperature. The direction changes. That is, in the upper portion of the heat treatment chamber, the pressure difference between the inside and outside of the heat treatment chamber is increased, and the pressure difference between the inside and the outside is reduced in the lower portion of the heat treatment chamber.

(air curtain unit)

A pair of pressurized chambers are disposed above and below the sealed outdoor wall inlet 7 9a, pressurized chamber 9b. Further, a pair of pressurizing chambers 9a' and pressurizing chambers 9b' are vertically disposed so as to sandwich the outlet wall 7' of the sealed outdoor wall. The pressurizing chamber is a box-shaped chamber that is pressurized by air supplied to the outside of the heat treatment device. A single air supply pipe 23 (having a branch pipe for supplying air to each pair of pressurizing chambers) shown in FIG. 2 is connected to all of the upstream pressurizing chambers, and further, via a common air supply path (not shown) It is connected to a supply air fan (not shown). Further, a single single supply pipe is connected to all of the downstream side pressurizing chambers, and is further connected to an air supply fan (not shown) via a common air supply path (not shown). Here, as the gas supplied to the pressurizing chamber (and the gas ejected from the nozzle of the air curtain unit), air, particularly air outside the heat treatment apparatus, has been described as an example, but a gas other than air may be used.

The passage is provided on the side opposite to the heat treatment chamber in the inlet side and the outlet side of the workpiece in each of the sealed chambers (the passage 19 is provided on the inlet 7 side of the upstream seal chamber, and the passage 19' is provided on the downstream side The outlet port 7' side of the sealed chamber). More specifically, a passage 19 is provided which extends from the sealed outdoor wall inlet 7 to the outside (upstream side) to the heat treatment device inlet 11 and supplies the object (precursor fiber bundle A) )by. Further, a passage 19' is provided which extends from the sealed outdoor wall delivery port 7' further toward the outer side (downstream side) to the heat treatment device delivery port 11', and the object to be treated passes therethrough.

A pair of rectangular nozzles are provided at the upper and lower positions of the respective passages (the pressurizing chamber 9a and the pressurizing chamber 9b), and the pair of rectangular nozzles face the center of the passage in the vertical direction and the workpiece facing the passage An opening in the inlet and the outlet on the opposite side to the sealed chamber (in the passage 19 is a heat treatment device inlet 11 in the passage 19' The air is sent out to the heat treatment device outlet 11'); and a gas flow rate adjustment mechanism (for example, a flow rate adjustment valve) is provided for adjusting the discharge amount of the gas for each nozzle. Specifically, in the upper and lower positions of the passage 19 sandwiching the precursor fiber bundle A, a pair of slit-shaped nozzles 10a and 10b are provided in order to suppress the flow of the outside air flowing into the heat treatment apparatus from the outside of the heat treatment apparatus. In the nozzle of the air curtain unit, the pair of slit-shaped nozzles 10a and 10b are directed toward the center of the passage in the vertical direction, and the air is ejected toward the opening of the heat treatment device feed port 11. Further, in the upper and lower positions of the passage 19' sandwiching the precursor fiber bundle A, a pair of slit-shaped nozzles 10a' and 10b' are provided to suppress the flow of the outside air flowing into the heat treatment apparatus from the outside of the heat treatment apparatus. (Nozzle of the air curtain unit), the pair of slit-shaped nozzles 10a' and 10b' are directed toward the center of the passage in the vertical direction, and the air is ejected toward the opening of the heat treatment device delivery port 11'. In the present specification, the term "nozzle" means a gas flow path (for example, an air passage) having a rectangular cross section.

By the upstream pressurizing chamber 9a, the pressurizing chamber 9b, the nozzle 10a, the nozzle 10b, and the passage 19, the outside of the sealed outdoor wall inlet 7 (upstream side) constitutes air blown outside the heat treatment device to suppress external air. Inflow of the air curtain unit 8 (upstream side). Further, the air curtain unit 8 (downstream) is formed on the outer side (downstream side) of the sealed outdoor wall delivery port 7' by the pressurizing chamber 9a' on the downstream side, the pressurizing chamber 9b', the nozzles 10a', 10b', and the passage 19'. side). The nozzle 10a, the nozzle 10b, the nozzle 10a', and the nozzle 10b' extend in a direction perpendicular to the moving conveyance direction of the workpiece (the depth direction of the paper in FIGS. 1 and 2).

In each passage, the inlet and the delivery of the object to be treated of the nozzle and the passage The longitudinal direction of the mouth is parallel and has a length equal to the length of the long side. In other words, in each of the passages, the inlet and the outlet of the passage are rectangular (the same rectangular shape as the cross section of the passage), and the long sides of the passage inlet and the outlet (the sides in the depth direction of the paper in FIG. 1) are parallel to each other. The long sides are arranged in parallel with the nozzles (especially the long sides of the gas discharge ports of the nozzles). The long sides of the passage inlet and the outlet have equal lengths, and the long sides of the passage inlet and outlet are equal to the length of the nozzle (especially the length of the long side of the gas discharge port of the nozzle).

Specifically, in the passage 19, the heat treatment device inlet 11 and the sealed outdoor wall inlet 7 are both rectangular (rectangularly the same as the cross section of the passage 19), and the long sides of the inlet 11 and the inlet 7 are parallel to each other. The nozzle 10a and the nozzle 10b (especially the long sides of the gas discharge ports of the nozzles) are arranged in parallel with respect to the long sides of the feed port 11 and the feed port 7. The long sides of the feed port 11 and the feed port 7 have the same length, and the lengths of the nozzles 10a and 10b (especially the lengths of the long sides of the gas discharge ports of the nozzles) are both long sides of the feed port 11 and the feed port 7. The length is equal. The same applies to the passage 19'. In this case, in the above description of the passage 19, the heat treatment device feed port 11 is referred to as a heat treatment device discharge port 11', and the sealed outdoor wall feed port 7 is referred to as a sealed outdoor wall feed. At the outlet 7', the nozzle 10a and the nozzle 10b are referred to as nozzles 10a' and 10b').

The sealed chamber is set to a negative pressure, and gas is ejected from the nozzle. The direction of the discharge is toward the center of the passage in the vertical direction, and is directed in the direction of the heat treatment device inlet or the heat treatment device delivery port on the opposite side of the sealed chamber from the workpiece inlet and outlet of the passage. Further, in this case, it is preferable that the gas is uniformly discharged over the length of the long side in parallel with the longitudinal direction of the inlet and the outlet of the object to be processed in the passage. The discharge amount V (m ³ /h) of the gas ejected from the nozzle in the longitudinal direction of the passage section and the pressure P (Pa) of the sealed chamber connected to the passage satisfy the following formula V≦-30×P In the case of +21, it is possible to reduce the amount of gas ejected from the nozzle and control the amount of gas flowing into the sealed chamber, which is preferable. In addition, unless otherwise indicated, the pressure is represented by gauge pressure. Since the gas discharge amount V is the discharge amount per meter in the longitudinal direction of the passage section, the unit is strictly "m ³ /h/m", but "m ³ /h" is used for simplification.

Further, the sealed chamber is set to a negative pressure, and the discharge amount V (m ³ /h) of the gas ejected from the nozzle per longitudinal direction of the passage section is preferably 21 m ³ /h or more.

By ejecting gas from the nozzle in this manner, the flow rate of the outside air flowing from the outside of the heat treatment apparatus to the heat treatment apparatus can be uniformly controlled in the longitudinal direction of the passage.

Further, the discharge velocity Vs of the gas ejected from the nozzle is preferably 3 m/s or more and 30 m/s or less. When the discharge speed Vs is 3 m/s or more, it is easy to uniformly control the flow rate of the outside air flowing in from the outside to the inside of the heat treatment apparatus in the longitudinal direction of the passage. When the discharge speed Vs is 30 m/s or less, it is easy to reduce the deterioration of the quality due to friction between the objects to be treated or friction between the devices due to the sway of the workpiece. The discharge speed Vs is preferably 15 m/s or less, more preferably 10 m/s or less, and more preferably 5 m/s or less from the viewpoint of cost reduction.

The flow rate of the gas introduced into the sealed chamber 4 from the above passage is preferably 0.1 m/sec or more and 0.5 m/sec or less. When the flow rate of the gas to be introduced is 0.1 m/sec or more, it is easy to uniformly control the flow rate of the outside air flowing from the outside to the inside of the heat treatment apparatus in the longitudinal direction of the passage, and if it is 0.5 m/sec or less, it is easy to suppress. An increase in exhaust gas due to the inflow of external air.

(air curtain unit nozzle position)

In each of the passages, the distance between the gas discharge port of the pair of nozzles and the opening of the passage (the heat treatment device inlet or the heat treatment device outlet) on the opposite side to the seal chamber is d, and the passage height is Dn. Preferably, it satisfies 2≦d<0.75Dn. When 2≦d<0.75Dn is satisfied, the amount of gas flowing into the sealed chamber can be easily controlled even if the amount of gas ejected from the nozzle is reduced. Specifically, from the viewpoint of preventing leakage of gas (for example, decomposition gas) from the inside of the sealed chamber, the upstream side is controlled from the viewpoint of suppressing the gas flowing in from the outside and reducing the amount of gas ejected from the gas ejection port. The distance between the pair of nozzles 10a, the gas discharge port of the nozzle 10b and the heat treatment device inlet port 11, and the distance between the pair of nozzles 10a' on the downstream side, the gas discharge port of the nozzle 10b', and the delivery port 11' of the heat treatment device are preferably respectively. It is 2 mm or more, more preferably 7 mm or more, and further preferably 15 mm or more. Moreover, it is more preferably d < 0.73 Dn, and still more preferably d < 0.70 Dn. Further, here, the distance between the heat treatment device feed port 11 and the air discharge port of the nozzle 10a, and the distance between the heat treatment device feed port 11 and the air discharge port of the nozzle 10b are set to be equal (this is preferable, but not Limited to this). Further, the distance between the heat treatment device delivery port 11' and the air ejection port of the nozzle 10a', and the air ejection of the heat treatment device delivery port 11' and the nozzle 10b' The distance between the outlets is set equal (this is preferred, but is not limited thereto). The distance between the inlet side and the outlet side can be determined independently of each other.

Further, the height Dn of the above passage is preferably 20 mm or more and 78 mm or less. When the passage height Dn is 20 mm or more, the object to be treated is not easily contacted with the passage, and the quality is likely to be lowered. When the diameter is not more than 78 mm, it is easy to suppress the increase in size of the equipment and the investment cost is suppressed.

The opening width Wn of the nozzle is preferably 0.5 mm or more and 3 mm or less. When the opening width Wn is 0.5 mm or more, the nozzle gap can be easily ensured, and if it is 3 mm or less, the nozzle discharge flow rate can be reduced, and the discharge wind speed can be easily controlled. Here, as shown in FIG. 4, the nozzle opening width Wn is a width of a projection (a surface parallel to the paper surface of FIG. 4) when the opening of the nozzle is projected onto a surface perpendicular to the flow direction of the gas flowing through the nozzle. length).

(nozzle construction)

In FIG. 2, the pressurizing chamber 9a and the pressurizing chamber 9b are pressurized by supplying air outside the heat treatment device from the air supply pipe 23. Further, the nozzle 10a provided in the pressurizing chamber 9a of the air curtain unit 8 is formed by the upper passage member (front member) 24 and the upper passage member (rear member) 25. Similarly, the nozzle 10b provided in the pressurizing chamber 9b is formed by the lower side passage member (front member) 24' and the lower side passage member (rear member) 25'.

The passage through which the workpiece to be fed from the heat treatment device inlet 11 passes is formed by the upper passage member, the lower passage member, and the side member, and is sandwiched by the upper passage member and the lower passage member. Each of the upper and lower passage members is composed of two members (the upper passage member is composed of the front member 24) as shown in FIG. And the rear member 25, the lower passage member is formed by the front member 24' and the rear member 25'). Similarly, the passage through which the workpiece to be sent from the heat treatment device delivery port 11' passes is also formed by the upper passage member, the lower passage member, and the side member, and is held by the upper and lower two passage members. . The spacer member 30 that determines the nozzle gap is interposed between the two members, and the two members (the front member and the rear member) are integrated (fixed) by a detachable locking tool such as a screw (not shown).

By adopting the above-described assembly structure, the production cost can be reduced. Moreover, the nozzle portion can be partially disassembled, thereby facilitating maintenance work.

Further, in order to fix the position of the front member, the front member fixing rail 26 is fixed to the air curtain unit by the front member fixing rail 26, and the front member fixing rail 26 includes a direction at right angles to the object to be processed (the depth of the paper surface of Fig. 2) Directional) extended board. In the case of the rear member, in order to fix its position, the gap between the two plates of the two parallel plates (the rear member fixing rail 27) is fixed to the air curtain unit, the two parallel plates (the rear member) The fixing rail 27) extends in a direction perpendicular to the object to be processed (the depth direction of the paper surface of Fig. 2).

Next, the action of this embodiment will be described.

As shown in Fig. 1, a plurality of precursor fiber bundles A are fed in parallel to the uppermost heat treatment device inlet 11 of the sealed chamber 4 on the left side of the heat treatment device 1 in a state in which they are aligned in parallel in the direction perpendicular to the plane of the paper. The heat treatment device (especially the air curtain unit 8 on the feed side). Then, the precursor fiber bundle passes through the sealed outdoor wall feed port 7 of the outer wall 5 of the sealed chamber 4 and the feed port 6 of the outer wall 3 of the heat treatment chamber 2, and is sent out from the feed port 6' of the opposite outer wall 3 of the heat treatment chamber 2. Further, the precursor fiber bundle A passes The delivery port 7' of the outer wall 5 of the sealed chamber 4 connected to the heat treatment chamber 2 is sent out to the outside of the heat treatment apparatus 1 through the curtain unit 8 (sending side). The precursor fiber bundle A sent out to the outside of the heat treatment apparatus 1 is folded back by being wound around the roller 18 provided outside the heat treatment apparatus, and is again fed from the lower one of the delivery outlets 7' It is sent to the inside of the heat treatment apparatus 1.

The precursor fiber bundle A fed again into the inside of the heat treatment apparatus 1 is sent to the outside of the heat treatment apparatus 1 through the same path in the reverse direction, and is again wound around the roller 18 outside the heat treatment apparatus 1 to be folded back. As described above, the precursor fiber bundle A is repeatedly fed back to the heat treatment apparatus 1 or sent out from the heat treatment apparatus 1 by the roller 18 while being repeatedly folded back outside the heat treatment apparatus 1, and passes through the inside of the heat treatment apparatus 1 in a meandering manner. At this time, the precursor fiber bundle A is energized by the rotation of the roller 18 and the friction of the surface of the roller 18, whereby the precursor fiber bundle A is continuously fed in the direction of the arrow X of FIG.

On the other hand, in the inside of the heat treatment chamber 2, the hot air is circulated by a hot air circulation device (not shown), and is maintained at a temperature of, for example, 200 ° C to 300 ° C. Therefore, the precursor fiber bundle A continuously fed into the inside of the heat treatment chamber 2 is slowly subjected to heat treatment in the heat treatment chamber 2. At this time, a decomposition gas such as a cyanide compound, ammonia, or carbon monoxide is generated in the heat treatment chamber 2 by the oxidation reaction of the precursor fiber bundle A. The gas in the heat treatment chamber is sent out by the exhaust fan 14, and is recovered and processed by an external gas recovery processing device. Further, the adjustment of the amount of exhaust gas from the exhaust port 20 provided in the heat treatment chamber 2 of the generated decomposition gas can be performed by a flow rate adjustment mechanism 13 such as a valve.

Further, inside the sealed chamber 4 and the sealed chamber 4, the exhaust gas is sucked by the exhaust fan 17 and the exhaust fan 17, and the negative pressure is generated. Further, in the heat treatment chamber 2, a pressure distribution in the vertical direction in which the upper portion is high pressure and the lower portion is low pressure is generated by heating. Here, the pressure in each of the block 4a, the block 4b, and the block 4c of the sealed chamber 4 and the sealed chamber 4 is adjusted to a pressure from which the gas can be self-sealed according to the pressure distribution in the vertical direction in the heat treatment chamber 2. 4. The inflow into the heat treatment chamber 2 in the sealed chamber 4 or the outflow of gas from the heat treatment chamber 2 into the sealed chamber 4 and the sealed chamber 4 is minimized, thereby preventing gas in the sealed chamber 4 and the sealed chamber 4 from being self-contained. The sealed chamber 4, the inlet port 7 of the sealed chamber 4, and the outlet port 7' flow out to the outside.

Further, in order to suppress the inflow of the outside air into the sealed chamber 4 and the sealed chamber 4 which become the negative pressure, the air outside the heat treatment apparatus 1 is supplied to the upper and lower pressurizing chambers 9a and 9b of the curtain unit 8, and The nozzle 10a and the nozzle 10b, the nozzle 10a', and the nozzle 10b' are ejected to the outside of the sealed chamber 4 and the sealed chamber 4 toward the precursor fiber bundle A, thereby forming an air curtain. At this time, air is ejected from the nozzle 10a and the nozzle 10b toward the feed port 11. Further, air is ejected from the nozzle 10a' and the nozzle 10b' toward the delivery port 11'.

At this time, the distance between the nozzle 10a, the nozzle 10b and the inlet 11 and the distance d (mm) between the nozzle 10a' and the nozzle 10b' and the delivery port 11' are preferably 2 ≦ d < 50, more preferably 15 ≦ d ≦ 30 . When the distance d is set to the above range, leakage of the decomposition gas from the sealed chamber can be reliably prevented, and the amount of air blown from the nozzle for ensuring the sealing property can be reduced. Here, the distance between the nozzle 10a and the inlet port 11, the distance between the nozzle 10b and the inlet port 11, the distance between the nozzle 10a' and the delivery port 11', the nozzle 10b' and the delivery The distances of the outlets 11' are all set equal.

The nozzle 10a is formed by an upper passage member (front member) 24 and an upper passage member (rear member) 25. Similarly, the nozzle 10b provided in the pressurizing chamber 9b is formed by the lower passage member (front member) 24' and the lower passage member (rear member) 25'.

As shown in FIG. 3, each of the upper and lower passage members is formed of two members with a nozzle interposed therebetween. The two members can be integrated (fixed) by sandwiching the spacer member 30 that determines the nozzle gap between the two members, and the detachable locking member such as a screw (not shown). This is because it is easy to perform the cleaning operation or the maintenance work of the nozzle portion while reducing the manufacturing cost.

The air uniformly distributed from the upper and lower sides is ejected from the upper and lower discharge ports of the nozzle 10a and the tip end of the nozzle 10b at substantially the same discharge speed Vs, and the precursor fiber bundle A forms an air curtain that collides up and down. Here, the discharge speed Vs of the air ejected from the nozzles 10a and 10b of each of the air curtain units 8 is adjusted so as not to be self-contained by the pressure in the block 4a, the block 4b, and the block 4c of the sealed chamber 4, the sealed chamber 4 The discharge rate of the gas flowing out to the outside of the sealed chamber 4 is made. The nozzle 10a' and the nozzle 10b' are also the same.

According to the present invention, the amount of air blown out from the nozzle for ensuring the sealing property can be reduced, and the load on the air curtain sealing device by the air blowing unit can be reduced.

The carbon fiber precursor fiber bundle is heat-treated in the above-described horizontal heat treatment apparatus, whereby a refractory fiber bundle can be produced.

Further, the refractory fiber bundle can be produced by the above-described method for producing a refractory fiber bundle, and the obtained refractory fiber bundle can be carbonized to produce a carbon fiber bundle.

[Examples]

Hereinafter, the embodiments of the present invention will be described, but the present invention is not limited by the embodiments.

Here, the analytic software is used to perform simulation under various conditions, and the optimal structure of the air curtain is derived.

First, focusing on the flow of gas from the atmosphere to the sealed chamber, the model in which the air curtain device is installed is simulated. The analytical method uses numerical fluid analysis (Computational Fluid Dynamics (CFD) method), and as analytical software, GAMBIT (trade name, ANSYS Japan Co., Ltd. for forming mesh and shape) and FLUENT (trade name) are used. , ANSYS Japan Co., Ltd., for analysis).

Further, the number of meshes was set to about 1.5 million meshes, and the simulation was performed at a calculation time of about 3 hours/CASE.

Fig. 7 is a diagram for explaining a model used here. In this model, in the sealed chamber (box for simulating the sealed chamber) 101, a passage for the air curtain (a flow path simulating the passage of the air curtain) 102 is opened, and the passage is opened outside the heat treatment device (the area outside the simulation) 104. A nozzle (a flow path of the dummy nozzle) 103a and a nozzle 103b of the air curtain are respectively disposed at an upper portion and a lower portion of the passage 102. The angle θ of the nozzle with respect to the horizontal plane is set to 30°, respectively. A heat treatment chamber inlet 105 is provided at the opposite side of the sealed chamber 101 from the passage 102.

As a condition of the simulation, the gas was set to air, the reference pressure was 101,325 Pa (atmospheric pressure) in absolute pressure, and the air temperature was set to 25 ° C, and the outflow conditions to the outside of the heat treatment apparatus were set to freely flow out.

The distance between the heat treatment device inlet 11 and the nozzles 10a and the gas outlet of the nozzle 10b (the distance between the opening of the passage 102 facing the outside of the heat treatment device and the gas outlet of the nozzle 103a and the nozzle 103b in the model) is 2 mm. ~70 mm, the height of the passage (the height of the passage 102 in the model) Dn is 10 mm to 80 mm, and the opening width of the nozzle (the opening width of the nozzle 103a and the nozzle 103b in the model) Wn is in the range of 0.5 mm to 5 mm. Change and implement calculations.

[Example 1]

The distance d is set to 10 mm, the passage height Dn is set to 20 mm, the nozzle opening width Wn is set to 1.1 mm, the pressure in the sealed chamber P is set to -0.5 Pa, and the gas ejection velocity Vs from the gas discharge port of the nozzle is set to 3 m. /s, and the gas inflow velocity Vo toward the sealed chamber is calculated. The conditions and the inflow rate in the sealed chamber are shown in Table 1. Further, in Tables 1, 2, and 4, the distance d is expressed as "the distance between the inlet 11 and the nozzle", and the passage height Dn is expressed as the "opening height".

[Embodiment 2]

The calculation was performed in the same manner as in Example 1 except that the distance d was set to 20 mm and the passage height Dn was set to 30 mm.

[Example 3]

The calculation was performed in the same manner as in Example 1 except that the distance d was set to 25 mm and the passage height Dn was set to 40 mm.

[Example 4]

The calculation was performed in the same manner as in Example 1 except that the distance d was 50 mm and the path height Dn was 70 mm.

[Example 5]

The calculation was performed in the same manner as in Example 4 except that the nozzle discharge air velocity Vs was 4.5 m/s.

[Comparative Example 1]

The calculation was performed in the same manner as in Example 1 except that the distance d was set to 15 mm and the passage height Dn was set to 20 mm. At this time, the air inflow velocity toward the sealed chamber could not be controlled to be 0.1 m/s or more, or it was confirmed that the gas in the self-sealing chamber was blown out to the outside of the heat treatment apparatus. There is no such blowing in the examples.

[Comparative Example 2]

The calculation was performed in the same manner as in Example 1 except that the distance d was set to 25 mm and the passage height Dn was set to 30 mm. In the same manner as in Comparative Example 1, the air inflow velocity in the sealed chamber could not be controlled to be 0.1 m/s or more, or it was confirmed that there was blowing.

[Comparative Example 3]

The calculation was performed in the same manner as in Example 1 except that the distance d was set to 30 mm and the path height Dn was set to 40 mm. In the same manner as in Comparative Example 1, the air inflow velocity in the sealed chamber could not be controlled to be 0.1 m/s or more, or it was confirmed that there was blowing.

[Embodiment 6]

When the distance d is set to 20 mm, the path height Dn is set to 30 mm, the nozzle opening width Wn is set to 1.1 mm, and the pressure P in the sealed chamber is set to -2 Pa, -5 Pa, -10 Pa, respectively, toward the sealed chamber. The gas inflow velocity Vo is 0.2 m/s, and the gas discharge velocity Vs (m/s) from the gas discharge port of the nozzle is calculated so as not to eject the gas from the passage to the outside of the heat treatment device. The gas discharge flow rate V (m ³ /h) from the nozzle in the width direction of the rice.

[Embodiment 7]

The calculation was performed in the same manner as in Example 6 except that the passage height Dn was set to 40 mm.

[Embodiment 8]

The calculation was performed in the same manner as in Example 6 except that the passage height Dn was 70 mm.

[Embodiment 9]

The calculation was performed in the same manner as in Example 6 except that the passage height Dn was set to 80 mm.

[Embodiment 10]

The calculation was performed in the same manner as in Example 7 except that the nozzle opening width Wn was set to 0.5 mm.

[Example 11]

The calculation was performed in the same manner as in Example 7 except that the nozzle opening width Wn was set to 2 mm.

[Embodiment 12]

The calculation was performed in the same manner as in Example 7 except that the nozzle opening width Wn was set to 3 mm.

[Example 13]

The calculation was performed in the same manner as in Example 7 except that the nozzle opening width Wn was set to 4 mm.

[Embodiment 14]

The calculation was performed in the same manner as in Example 7 except that the nozzle opening width Wn was set to 5 mm.

[Comparative Example 4]

The calculation was performed in the same manner as in Example 6 except that the passage height Dn was set to 10 mm. When the pressure in the sealed chamber is -2 Pa, -5 Pa, -10 Pa, the gas discharge speed Vs (m/s) from the gas discharge port of the nozzle is adjusted, if it faces the sealed chamber When the gas inflow velocity Vo is 0.2 m/s, the gas can be prevented from ejecting from the passage to the outside of the heat treatment apparatus. It is assumed that when the pressure in the sealed chamber is further reduced to -0.5 Pa, the gas is ejected to the outside of the heat treatment apparatus. .

[Comparative Example 5]

The calculation was performed in the same manner as in Example 6 except that the passage height Dn was set to 20 mm. When the pressure in the sealed chamber is -2 Pa, -5 Pa, -10 Pa, the gas discharge velocity Vs (m/s) from the gas discharge port of the nozzle is adjusted, and if the gas inflow velocity Vo toward the sealed chamber is 0.2 m /s, the gas can be prevented from ejecting from the passage to the outside of the heat treatment apparatus. It is assumed that when the pressure in the sealed chamber is further reduced to -0.5 Pa, the gas is ejected to the outside of the heat treatment apparatus.

In the following experiment, instead of the actual heat treatment furnace 1 shown in Fig. 1, the gas ejection speed (from the nozzle 10a and the nozzle 10b) was performed using the test apparatus 100 having the schematic configuration of the heat treatment chamber 2 shown in Fig. 4 The velocity of the discharged air is Vs, the distance d between the nozzle 10a, the gas discharge port of the nozzle 10b and the heat treatment device inlet 11 and the measurement of the gas inflow velocity Vo from the sealed outdoor wall inlet 7 toward the sealed chamber. The inlet 6 and the sealed outdoor wall inlet 7 of the sealed chamber 4 have an opening length of 2000 mm (length in the depth direction of the drawing) and an opening height of 40 mm (hence Dn = 40 mm). The opening length of the opening of the nozzle 10a and the nozzle 10b was 2000 mm (the length in the depth direction of the drawing), and the opening width Wn was 1.1 mm. The angle θ of the nozzle 10a and the nozzle 10b with respect to the horizontal plane is set to 30°, respectively.

Further, when the gas flows into the sealed chamber 4 from the sealed outdoor wall inlet 7 or the gas flows out from the sealed chamber through the inlet 7, the smoke tester manufactured by Gastec Co., Ltd. is used for observation. And confirm the flow direction of the smoke. Further, the nozzle discharge speed Vs was measured using an Anemometer 6071 anemometer (trade name) manufactured by Kanomax Co., Ltd.

In addition, since it is difficult to directly measure the gas inflow velocity Vo, the Anemometer 6071 anemometer (trade name) manufactured by Kanomax Co., Ltd. is used to measure the amount of exhaust gas of the exhaust fan 17 and the inflow amount from the inlet 6 and, depending on the difference. Calculated. The pressure in the sealed chamber 4 was measured using a differential pressure gauge (Manostar Gage) manufactured by Yamamoto Electric Co., Ltd.

The air ejected from the nozzle 10a of the air curtain unit 8 and the gas discharge port of the nozzle 10b is supplied from an air supply fan (not shown). Ejected from each nozzle of the air curtain unit 8 At the speed Vs, the sealed chamber is set to a negative pressure by the exhaust fan 17, and the internal pressure of the sealed chamber 4 is measured by the Manostar Gage provided on both the front side of the paper surface and the inner side of the paper. At this time, in the sealed outdoor wall inlet 7, the smoke detector is used to observe the flow direction of the smoke, and the nozzle discharge speed of the gas discharge ports from the nozzle 10a and the nozzle 10b is adjusted so as to be in the direction of the furnace width (near the paper surface) The gas does not flow out of the sealed chamber 4 over the entire range from the front side to the inner side of the paper surface. An example of the relationship between each sealed chamber pressure and a suitable nozzle discharge speed Vs is shown in Table 3 and FIG. 5 below. In addition, the sealed chamber pressure (unit Pa) is represented by gauge pressure. The nozzle 10a at the example shown in Table 3 and the distance d between the gas discharge port of the nozzle 10b and the heat treatment device inlet 11 were 20 mm.

As can be seen from Table 3 and FIG. 5, the lower the internal pressure of the sealed chamber 4, the more the nozzle discharge speed Vs must be increased.

Here, the distance d between the gas discharge port of the nozzle 10a and the nozzle 10b and the heat treatment device inlet 11 is adjusted based on the discharge velocity Vs of the air ejected from the nozzles 10a and the gas discharge port of the nozzle 10b.

[Example 15]

As in the above experiment, in the present experiment, the test apparatus 100 of the schematic configuration shown in Fig. 4 was used. The distance between the gas discharge port of the nozzle 10a and the heat treatment device inlet 11 and the distance between the gas discharge port of the nozzle 10b and the heat treatment device inlet 11 are both set to 2 mm (d = 2 mm), by changing the amount of gas supplied toward the nozzle. The nozzle discharge air velocity Vs was set to three conditions of 5.2 m/s, 9.96 m/s, and 14.8 m/s. Under the conditions of the jetting speed of each nozzle, the smoke detector is used to observe the flow direction of the smoke at the sealed outdoor wall inlet port 7, and the exhaust fan 17 is adjusted so as to be in the direction of the furnace width (from the front side to the inner side of the paper surface) The gas does not flow out of the sealed chamber 4 over the entire range, and the internal pressure of the sealed chamber 4 is measured by a differential pressure gauge. Similarly to the above experiment, Dn was set to 40 mm, Wn was set to 1.1 mm, the opening length of the heat treatment outdoor wall inlet 6 and the sealed outdoor wall inlet 7 was set to 2000 mm, and the opening length of the nozzle opening was also set to 2000 mm. The angle θ of the nozzle with respect to the horizontal plane is set to 30°.

[Example 16]

The measurement was carried out in the same manner as in Example 15 except that the distance d between the gas discharge port of the nozzle 10a and the nozzle 10b and the heat treatment device inlet 11 was set to 5 mm.

[Example 17]

The measurement was carried out in the same manner as in Example 15 except that the distance d was changed to 10 mm.

[Embodiment 18]

The measurement was carried out in the same manner as in Example 15 except that the distance d was set to 15 mm.

[Embodiment 19]

The measurement was carried out in the same manner as in Example 15 except that the distance d was changed to 20 mm.

[Example 20]

The measurement was carried out in the same manner as in Example 15 except that the distance d was changed to 25 mm.

[Example 21]

The measurement was carried out in the same manner as in Example 15 except that Dn was set to 30 mm and the distance d was set to 20 mm.

[Comparative Example 6]

The measurement was carried out in the same manner as in Example 15 except that the distance d was set to 0 mm. At this time, when the nozzle is produced, it is difficult to perform processing when the nozzle discharge port is provided at a position where the distance d is set to 0 mm, and therefore the distance d is set to 2 mm or more.

[Comparative Example 7]

The measurement was carried out in the same manner as in Example 15 except that the distance d was changed to 30 mm. At this time, when the nozzle blowing air velocity (Vs) was 5.2 m/s, the pressure in the sealed chamber was set to -1.35 Pa, and the gas inflow velocity (Vo) in the sealed chamber was set to 0.2 m/s, and then the gas self-feeding inlet was confirmed. Part of 7 is blown out. However, there is no such blow in the embodiment. In this case, when d<0.75Dn is not satisfied (in this example, d=0.75Dn), a portion where the blowing of the furnace gas is confirmed is generated in a direction perpendicular to the moving conveyance direction of the workpiece. The gas in the sealed chamber 4 leaks from the inlet 7 to the outside of the heat treatment apparatus 1.

The results of Examples 15 to 21, Comparative Example 6, and Comparative Example 7 are shown in Table 4. Further, the results of Examples 15 to 20 and Comparative Example 6 are shown in Fig. 6 .

Fig. 6 shows the relationship that the nozzle discharge air velocity Vs is set to 5.2 m/s, 9.96 m/s, and 14.8 m/s, and the gas discharge port and the heat treatment for adjusting the nozzle 10a and the nozzle 10b are replaced by replacement. The distance d of the device feeding inlet 11 When the distance d is changed as shown in the following Table 4, the target line of the gas inflow velocity Vo = 0.2 m/s can be achieved (to ensure that it is not in a direction perpendicular to the moving direction of the object to be processed) The relationship between the sealed chamber pressure and the distance d is the gas inflow velocity at which the furnace gas is blown out. In the graph, the point of the rhombus indicates the data when the nozzle blowing wind speed Vs=5.2 m/s, and the point of the quadrilateral indicates the data when the nozzle blowing wind speed Vs=9.96 m/s, and the point of the triangle indicates the nozzle. The data when the wind speed Vs=14.8 m/s is blown out.

As shown in Fig. 6, at the nozzle discharge wind speed, when the d is extended, the pressure in the sealed chamber when the target gas inflow velocity is adjusted to approximately 0.2 m/s is lowered. This means that if the pressure is the same in the sealed chamber, the external air inflow speed can be adjusted with a smaller nozzle discharge speed by extending d. In particular, under the condition of d=0, the nozzle discharge wind speed required to adjust the gas inflow speed increases. According to Table 4 and Figure 6, at the nozzle discharge wind speed, as d is extended in the range of 2 mm or more, the sealing pressure at the target gas inflow speed of 0.2 m/s is lower, and d is 15 mm or more. This tendency is more pronounced within the scope of this.

Further, the present invention is not limited to the above embodiment. For example, the precursor fiber bundle can be moved and transported in the up-and-down direction from the upper to the right side depending on the condition.

1‧‧‧Horizontal heat treatment unit

2‧‧‧heat treatment room

3‧‧‧ Heat treated outdoor wall

4‧‧‧ Sealing room

4a, 4b, 4c‧‧‧ blocks

5‧‧‧The outer wall of the sealed room

6‧‧‧ Heated entrance to the outdoor wall

6'‧‧‧ Heat-treated outdoor wall outlet

7‧‧‧ Sealed outdoor wall entrance

7'‧‧‧Seaned outdoor wall outlet

8‧‧‧Air curtain unit

9a, 9b‧‧‧Pressure chamber (upper and lower)

9a', 9b'‧‧‧ Pressurization chamber (upper side and lower side)

10a, 10b‧‧‧Send into the side curtain nozzle (upper side and lower side)

10a', 10b'‧‧‧Send side air curtain nozzles (upper side and lower side)

11‧‧‧ Heat treatment unit entrance

11'‧‧‧ Heat treatment unit for export

12‧‧‧Isolation board

13, 16‧‧‧ flow adjustment mechanism

14, 17‧‧‧ exhaust fan

15‧‧‧Exhaust port

18‧‧‧Roller

19‧‧‧Access to the side curtain unit

19'‧‧‧Access to the side curtain unit

20‧‧‧ venting holes

21‧‧‧Exhaust path

22‧‧‧Exhaust path

A‧‧‧Precursor fiber bundle (bundle)

X‧‧‧Moving transport direction of precursor fiber bundles

Claims (13)

In a horizontal heat treatment apparatus, a continuous flat heat-treated material is continuously transported while being transported in a horizontal direction in a heat treatment chamber, and a first processed material inlet and a first processed object are sent to the heat treatment chamber. Each of the outlets is connected to a sealed chamber, wherein the sealed chamber is connected to an exhaust fan, and the sealed chamber is configured such that the processed object can pass through the sealed chamber in a horizontal direction, and the second processed object is fed into the sealed chamber and An opening on the opposite side of the heat treatment chamber in the second processed object delivery port is connected to a passage having a rectangular cross section, and the passage is configured such that the workpiece can pass through the passage in a horizontal direction and the sealed chamber The third processed object inlet of the passage connected to the second processed object inlet is the fourth processed material inlet of the heat treatment apparatus, and is connected to the second processed material outlet of the sealed chamber. The third processed object delivery port of the passage is the fourth processed object delivery port of the heat treatment device, and is disposed at a position above and below each of the passages. a pair of nozzles for ejecting a gas, wherein the gas ejection ports of the respective nozzles have a rectangular shape, and in the respective passages, the pair of nozzles provided in the passage face the center of the passage in the vertical direction and face the above-mentioned passage The fourth processed object delivery port or the fourth processed object delivery port of the heat treatment device discharges the gas, and the respective gas passages of the respective nozzles provided in the passage and the third passage of the passage are formed in the respective passages Longitudinal direction of the processing inlet and the delivery outlet In parallel, the length of the long side is equal to the length of the long side, and in the respective passages, the gas discharge port of the pair of nozzles provided in the passage and the fourth processed object of the heat treatment device included in the passage The distance d mm between the delivery port or the fourth processed object delivery port and the height Dn mm of the above-described passage satisfy 2 ≦ d < 0.75 Dn. The horizontal heat treatment apparatus according to claim 1, wherein the distance d is 15 mm or more in each of the passages. In the horizontal heat treatment apparatus according to the first or second aspect of the invention, in the respective passages, the opening width Wn of the nozzle is 0.5 mm or more and 3 mm or less, and the height Dn of the passage is 20 mm or more and 78 mm or less. The horizontal heat treatment apparatus according to the first or second aspect of the invention, wherein the plurality of objects in the vertical direction are transportable in the horizontal direction, and the plurality of objects are vertically transported in the vertical direction. The above-described passages are respectively disposed at positions, and the sealed chambers are divided corresponding to the respective passages. The horizontal heat treatment apparatus according to claim 1 or 2, further comprising a gas flow rate adjusting mechanism that adjusts a discharge amount of the gas for each of the nozzles. The transverse heat treatment apparatus according to claim 1 or 2, wherein the passage is formed by an upper passage member, a lower passage member, and a side member. The upper and lower passage members each have two members via the nozzle, and the two members are integrated between the two members with a space member interposed therebetween, and the spacer member determines a gap between the nozzles. The transverse heat treatment apparatus according to claim 6, wherein the two members and the spacer member are detachably attachable. The horizontal heat treatment apparatus according to claim 1 or 2 is a heat treatment furnace for heat-treating a carbon fiber precursor fiber bundle. A method for producing a refractory fiber bundle, wherein a carbon fiber precursor fiber bundle is heat-treated in a horizontal heat treatment device to produce a refractory fiber bundle, and the horizontal heat treatment device has a continuous flat object to be processed along a side of the heat treatment chamber The heat treatment is continuously performed while moving in the horizontal direction, and a sealed chamber is connected to the first processed object inlet and the first processed object outlet in the heat treatment chamber, wherein the sealed chamber is connected to an exhaust fan, and the sealed chamber is The object to be processed is configured to pass through the sealed chamber in the horizontal direction, and is connected to an opening on the opposite side of the heat treatment chamber from the second processed object inlet and the second processed object outlet of each of the sealed chambers. a passage having a rectangular cross section, wherein the passage is configured such that the workpiece passes through the passage in a horizontal direction, and the third workpiece inlet of the passage connected to the second workpiece inlet of the sealed chamber is The fourth processed object of the heat treatment device is sent to the inlet, and is connected to the second processed object delivery port of the sealed chamber. The third processed object delivery port of the passage is a fourth processed object delivery port of the heat treatment device, and a pair of nozzles for ejecting gas are provided at upper and lower positions of the respective passages, and the gas ejection ports of the respective nozzles are rectangular. In the respective passages, the pair of nozzles provided in the passage face the center of the passage in the vertical direction, and the fourth processed object inlet or the fourth processed object of the heat treatment device included in the passage The gas is ejected from the delivery port, and the gas ejection ports of the respective nozzles provided in the passage are parallel to the longitudinal direction of the third processed material inlet and outlet of the passage, and have the same length The length of the side is equal to the length, and the gas discharge ports of the pair of nozzles provided in the passage and the fourth workpiece inlet or the fourth of the heat treatment device included in the passage are a distance d mm between the discharge ports of the workpiece, and a height Dn mm of the passages satisfying 2≦d<0.75Dn; and the refractory fiber bundle The manufacturing method includes: using the exhaust fan to make each of the sealed chambers a negative pressure, and in each of the passages, a length of the third processed object inlet and the outlet of the passage provided in each of the passages of the passage The gas discharge amount per metre is expressed as V m ³ /h, and when the gauge pressure in the sealed chamber connected to the above-mentioned passage is expressed as P Pa , the gas is self-contained in a manner of satisfying V ≦ 30 × P + 21 Each of the above nozzles is ejected. The method for producing a refractory fiber bundle according to the invention of claim 9, wherein the flow rate Vo of the gas flowing into the sealed chamber from the respective passages is 0.1 m/sec or more and 0.5 m/sec or less. The method for producing a refractory fiber bundle according to the above aspect of the invention, wherein the discharge rate Vs of the gas ejected from each of the nozzles is 3 m/s or more and 30 m/s or less. A method of producing a refractory fiber bundle by the method for producing a refractory fiber bundle according to any one of claims 9 to 11, and a refractory The step of carbonization of the fiber bundle. In a heat treatment method, the continuous heat treatment apparatus according to any one of the first to eighth aspects of the present invention is used to continuously heat-treat the continuous flat object.